单选题：Consider a page reference string for a process with M frames, in

Consider a page reference string for a process with M frames, initially all empty. The length of page reference string is L with D distinct page numbers in it.What is a lower bound on the number of page faults? @[B](1)
A. M
B. D
C. L-D
D. D+M





A.M
B.D
C.L-D
D.D+M


答案：B